(8th) Chapter 6-3 Cornell Notes

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Presentation transcript:

(8th) Chapter 6-3 Cornell Notes “Observing Chemical Change”

(8th) Chapter 6-3 Cornell Notes Key Questions (8th) Chapter 6-3 Cornell Notes What factors affect the rate of a chemical reaction? How is activation energy related to chemical reactions?

(8th) Chapter 6-3 Cornell Notes Key Terms activation energy- concentration- catalyst- enzyme- inhibitor-

(8th) Chapter 6-3 Cornell Notes 511 × 511 - en.wikipedia.org Paragraph 1 activation energy: minimal E needed to start reaction; all chemical reactions need it; exothermic products less E than reactants, heat released & E no longer needed; endothermic products more E than reactants so need more E to keep going.

(8th) Chapter 6-3 Cornell Notes 511 × 511 - en.wikipedia.org (8th) Chapter 6-3 Cornell Notes Paragraph 2 chemical reactions have different rates; Factors affecting reaction rates: surface area; temperature; concentration; presence of catalysts; presence of inhibitors.

(8th) Chapter 6-3 Cornell Notes 511 × 511 - en.wikipedia.org Paragraph 3 in solids: only particles on surface area react with reactants; increase rate of reaction by breaking up solid (more material exposed).

(8th) Chapter 6-3 Cornell Notes Paragraph 4 511 × 511 - en.wikipedia.org (8th) Chapter 6-3 Cornell Notes fast moving particles more E, more E gets over “activation hump”. increase temperature increases rate of reaction: particles move faster, more chance of colliding/reacting;

(8th) Chapter 6-3 Cornell Notes 511 × 511 - en.wikipedia.org Paragraph 5 increase concentration increases rate of reaction: concentration: amount of substance in a given volume; higher concentration more particles to react.

(8th) Chapter 6-3 Cornell Notes 511 × 511 - en.wikipedia.org (8th) Chapter 6-3 Cornell Notes Paragraph 6 change/lower amount of activation energy needed increases rate of reaction: catalyst: affect reaction rate but not a reactant; enzymes: biological catalysts like saliva.

(8th) Chapter 6-3 Cornell Notes 511 × 511 - en.wikipedia.org Paragraph 7 inhibitor: material used to decrease rate of reaction: most inhibitors prevent reactants coming together.